HighLevel Marketplace Apps
Custom apps listed on the HighLevel marketplace that install into client sub-accounts with one click. OAuth, scopes, webhooks, and the full install flow handled.
GHL API & Custom Dev
Hire GoHighLevel API Developers for Custom Apps
Custom applications, marketplace apps, and platform extensions for GoHighLevel. Tell us the build and we will scope it.
HighLevel Marketplace AppsCustom ObjectsApproval WorkflowsMERN · .NET · LaravelServer-Side Logic
Free Developer Scoping Call
Tell us what you need built and we will scope the API work.
STEP 1 · WHO ARE YOU?
MarketplaceListed developer
Custom ObjectsBeyond native fields
3 stacksMERN, .NET, Laravel
ProductionCode review and docs
OverviewBook a Developer Call
What a GoHighLevel API Developer Actually Does
GoHighLevel has a complete REST API, webhooks, custom objects, approval workflows, and a HighLevel marketplace that accepts custom apps. Most agencies never touch any of it because configuring the native UI gets them 80% of the way there. For the other 20% — the parts that make your business distinctive — you need engineers who can write server-side code against the GHL API.
GHL Prime builds the pieces that live outside the GoHighLevel UI: custom marketplace apps that install into client sub-accounts, custom objects that store business data the standard contact and opportunity models cannot hold, approval workflows that gate multi-step processes, and server-side services that extend GoHighLevel’s capabilities for use cases the native platform does not cover.
Pair custom development with our API & webhook integrations for the data-flow layer, vibe coding for AI-assisted builds, Figma to code for the front end, app development for mobile, and custom SaaS development for full product work. Book a developer call and we will scope your project with real engineering estimates.
custom-object.ts
What is included
GHL Custom Development: What We Deliver
Custom Objects
Business data the standard contact and opportunity models cannot hold: policies, properties, matters, projects, inventory. Full CRUD UI, workflows, and reporting.
Approval Workflows
Multi-stage approval processes with role-based routing, SLA tracking, and audit logs. For insurance underwriting, legal review, invoice approval, hiring workflows.
Server-Side Extensions
Custom backend services in Node, .NET, or Laravel that extend GoHighLevel with business logic the native platform cannot run: complex calculations, document generation, external API orchestration.
Webhook Architecture
Production-grade webhook consumers with retry logic, signature verification, dead-letter queues, and observability so your automations do not silently fail at 3am.
Custom API Endpoints
Internal and partner API endpoints that wrap GoHighLevel data with your business logic, authentication, and rate-limiting so external systems integrate against your API surface, not GHL’s raw one.
OAuth & Multi-Tenant Auth
OAuth 2.0 flows for marketplace apps, multi-tenant identity, and per-sub-account scoped tokens so your app installs cleanly into agency clients.
Developer Tooling and SDKs
Internal SDKs, CLI tools, and automation scripts your team uses to maintain custom builds without having to re-learn the GHL API every time.
The process
How Custom GHL Development Works
01
Architecture Discovery
We walk through your business process, identify what native GoHighLevel can and cannot handle, and design the custom layer with you before any code is written.
02
Technical Spec & Estimate
We produce a written technical spec, data model, API contract, and engineering estimate so you know scope, cost, and timeline before approving the build.
03
Build & Code Review
Our engineers build in your stack of choice (MERN, .NET, Laravel) with internal code review, test coverage, and staging deployments so you see progress weekly.
04
Deploy & Handover
Production deployment, documentation, source code handover, and training for your internal team on how to maintain and extend the build.
Who we work with
Who Hires GHL Prime for Custom Development
Agencies Building Marketplace Apps
Agencies productizing their GoHighLevel expertise as installable marketplace apps for recurring revenue beyond services.
Enterprise GHL Users
Large GHL users whose workflows exceed native UI capabilities — insurance, financial services, multi-location operators with complex approval needs.
SaaS Companies on GHL
SaaS companies built on GoHighLevel’s SaaS Mode needing custom features their customers ask for that native GHL does not support.
Integration-Heavy Operations
Businesses with 5+ platforms in their stack needing custom middleware that keeps data in sync and runs business logic across systems.
Why GHL Prime
Why Hire GHL Prime for API Development?
Most GoHighLevel freelancers configure the UI and plug into Zapier. GHL Prime employs engineers who write production server-side code against the GoHighLevel API in multiple stacks.
Listed developers on the HighLevel marketplace with shipped apps
Full-stack engineering teams in MERN, .NET, and Laravel
Production practices: version control, code review, test coverage, CI/CD
Custom objects, approval workflows, and marketplace OAuth experience
Technical specs and estimates before any code is written
Source code and documentation handed over at the end of every project
01What can GoHighLevel’s API actually do?
The GoHighLevel API supports full CRUD for contacts, opportunities, pipelines, workflows, calendars, forms, surveys, campaigns, custom fields, custom objects, and sub-accounts. OAuth 2.0 handles marketplace app auth, webhooks fire on 50+ events, and the API supports both agency-level and location-level scopes. We work with the full API surface.
02What is a custom object and when do I need one?
A custom object is a user-defined data model beyond GoHighLevel’s built-in contact, opportunity, and company types. If your business tracks something that is not a person or a deal — policies, properties, matters, projects, inventory, assets — a custom object stores it with its own fields, relationships, workflows, and reporting.
03Can you build a custom app for the HighLevel marketplace?
Yes. We build custom apps that list on the HighLevel marketplace with the full install flow: OAuth 2.0 consent, scope management, webhook subscription, and in-app configuration UI. Agencies and SaaS companies use marketplace apps as a productized revenue stream and a distribution channel for custom functionality.
04What stacks do your GHL developers work in?
Our primary stacks are MERN (MongoDB, Express, React, Node), .NET (C#, ASP.NET Core, SQL Server), and Laravel (PHP, MySQL/PostgreSQL). We also use Supabase and PostgreSQL for AI and SaaS projects. We match the stack to your existing infrastructure or recommend one if you are starting fresh.
05What is the difference between this and your API & webhook integrations service?
API & webhook integrations handle data flow between GoHighLevel and other platforms (SMS to Slack, forms to Google Sheets, Stripe to invoices). Custom development builds new functionality on top of GoHighLevel: custom objects, marketplace apps, server-side logic, and features native GHL does not have. Many clients use both services together.
06What happens after you deliver the custom build?
You receive the source code, full documentation, deployment guides, and a training session for your team. For ongoing maintenance, enhancements, or new features, many clients retain us on a monthly developer retainer or project basis. You are never locked in — the code is yours to maintain internally if you choose.
Why do agencies hire GHL Prime instead of a freelancer?Focused Expertise. Real
Focused Expertise. Real
Delivery Power.
GHL Prime is specialized team backed by Octopi Digital. We don’t do everything we go deep on GHL,automation, AI, and custom dev so your agency has the best possible team behind it.
Need GoHighLevel to Do Something Native Cannot?
Technical discovery call. Spec and estimate in a week.